XP USB Control

July 2, 2009 at 12:43:20
Specs: Windows XP, Old Skool Pentium 4 Prescott 3.06 GHZ/ 1 GB Corsair
What registry keys/files affect USB under windows XP? I know that USB runs at 5V but when the computer goes into sleep, standby etc I hear that the OS determines what mode the USB port is in and how much voltage to feed it? Everything i've found so far points me that USB is not controlled by hardware such as a motherboard.

Basically, I have a USB device thats having problems when the computer starts. It wont initialize on startup. But if I remove the device, then re insert it, it acts normally. Im trying to figure out what is causing this. (and why when i re plug it in it refreshes and works then, but not before) Gets hung on initializing device and hangs. Does not lock up system just sits there and looks at me. But when I remove it plug it back in it initializes fine.

Im getting a voltmeter later today im going to put it on the pins and startup the computer see what changes while its booting.

Are there any files or registry keys within the operating system of XP that someone can alter values or change. Anything. Anything at all, any settings that have to do with USB.

Im pretty sure that when the computer boots the device is in low power mode. But when I re plug it back in it switches to high power mode. Im trying to figure out how to make this more stable.


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#1
July 2, 2009 at 13:15:27
Start at acpi and apm.

"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10


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#2
July 2, 2009 at 13:23:50
I have a USB device thats having problems ..

What USB device?

i_Xp/VistaUser


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#3
July 2, 2009 at 14:12:24
a radio frequency reciever. Its for like radio tags.

I want it to start with the system, but its like on half power I guess. I came to this conclusion because when I started the machine and it did this the last time the lights were off, and the LED on the device came on but was very very weak. When I un plug then plug back in, then it gets the power its supposed to. (the LED is full brightness)

So i was thinking maybe theres a file like a .ini I could change to tell the system to ALWAYS give the device full power, even at startup.


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Related Solutions

#4
July 2, 2009 at 14:18:06
Start at acpi and apm.

acpi

C windows inf???

apm

i have a ntapm in c windows inf???


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#5
July 2, 2009 at 15:09:27
A USB port should always give full power, even at startup. There's no setting to change, as this is should happen at all times.

Do you have problems with other USB devices that are connected (if any)?

WinSimple Software
CompTIA A+ Certified


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#6
July 2, 2009 at 19:31:43
http://download.microsoft.com/downl...

"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10


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#7
July 5, 2009 at 15:18:27
Thanks for all of your help! Combined with the answers I got and jefro's awesome .doc i can now troubleshoot this. Thanks to all!

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#8
July 5, 2009 at 18:23:45
Have you tried a powered USB hub for "this" device?

Jabbering Idiots: Everywhere You Look!


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#9
July 14, 2009 at 12:06:50
No thanks, Im pretty sure jefro answeredmy question. I really dont want to use a powered USB hub because that just adds more complexity than there already is. Plus, these USB hubs, and devices are all so different, when i hook a voltmeter up to this stuff I can really see how cheap and un reliable USB really is... I wish our company would use firewire...

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